FileNotFoundException，该文件存在Java [英] FileNotFoundException, the file exists Java

问题描述

我有一个很奇怪的问题，我试图用一些Java代码和JLayer来播放一些MP3。我有一个方法设置来生成文件路径，但它给了我很多的悲伤。这里是return语句（和方法中涉及的所有代码）：

pre $ private static String findSoundFile（String numSeq）
{
returnfile：/// Users / user / Desktop / FinishedPhone /+ numSeq +.mp3
}

我有一组可能~150个mp3文件，全部命名为1.mp3，2.mp3等，它们达到约156（有一些在两者之间缺失）。根据用户输入的3位数字代码，它播放其中一个声音。这个代码对于1-99之间的任何东西都是完美的，当它达到100时，它停止工作。当用户使用100或者110或者你有什么时，Java抛出一个FileNotFoundException异常。我向你保证，文件在那里。下面是使用findSoundFile返回的文件路径的代码：

  public static void processNumberSequence（String numSeq）throws IOException 
 {
 if（numSeq！=）
 {
 String soundLoc = findSoundFile（numSeq）; 
档案档案=新档案（soundLoc）; 
 System.out.println（System can read：+ file.canRead（））; 
 System.out.println（soundLoc）; 
 SoundPlayer soundToPlay = new SoundPlayer（soundLoc）; 
 soundToPlay.play（）; 
 
 
 $ / code $ / pre 
 
 
当我填入空格numSeq应该填入，像这样：
 
 pre $私有静态字符串findSoundFile（字符串numSeq）
 {
返回file：///Users/user/Desktop/FinishedPhone/110.mp3; 
 
 
 
 $ b $ p 
 $ b 
上面的代码工作正常，没有挂断就播放声音。任何想法将不胜感激，请询问是否有任何混淆。
 
 
 
堆栈跟踪：
  java.io.FileNotFoundException：/Users/user/Desktop/FinishedPhone/111.mp3（没有这样的文件或目录）
在java.io.FileInputStream.open（本地方法）$ b （FileInputStream.java:120）
在java.io.FileInputStream。< init>（FileInputStream.java:79）
 at sun.net .www.protocol.file.FileURLConnection.connect（FileURLConnection.java:70）
 at sun.net.www.protocol.file.FileURLConnection.getInputStream（FileURLConnection.java:161）
 at java.net （URL.java:1010）
在SoundPlayer.play（SoundPlayer.java:26）
在SerialProcessor.processNumberSequence（SerialProcessor.java:37）
在SerialTest.serialEvent（ SerialTest.java:98）
 at gnu.io.RXTXPort.sendEvent（RXTXPort.java:732）
 at gnu.io.RXTXPort.eventLoop（Native Method）
 at gnu.io. RXTXPort $ MonitorThread.run（RXTXPort.java:1575）
  
 ls -l其中一个档案： 
 
 
  -rw-r  -  rw- 1位使用者432923 Feb 27 14:15 /Users/user/Desktop/FinishedPhone/111.mp3 
  
 
 
 
 
 ls -l 100以下的一个：
 $ b 
  -rw -r -rw- 1用户人员480570 Feb 25 20:43 /Users/user/Desktop/FinishedPhone/99.mp3 
  
 
 
解决方案
你的numSeq有问题。尝试像这样修剪
 
 
 $ p $  returnfile：/// Users / user / Desktop / FinishedPhone /+ numSeq.trim （）+.mp3 
  
 
I have a very strange issue, I'm trying to play some MP3s with some Java code and JLayer. I have a method setup to generate the file path, but it's giving me a ton of grief. Here is the return statement (and all the code involved in the method):
private static String findSoundFile(String numSeq)
{
    return "file:///Users/user/Desktop/FinishedPhone/" + numSeq + ".mp3"
}
I have a set of maybe ~150 mp3 files, all named 1.mp3, 2.mp3 etc. They go up to about 156 (there's some missing in between). Based on user input of a 3 digit code, it plays one of the sounds. This code works flawlessly for anything between 1-99, its when you get to 100 where it stops working. When the user punches in 100 or 110 or what have you, Java throws a FileNotFoundException. I assure you, the file is there. Here is the code that uses the filepath returned by findSoundFile:
public static void processNumberSequence(String numSeq) throws IOException
{
    if (numSeq != "")
    {
        String soundLoc = findSoundFile(numSeq);
        File file = new File(soundLoc);
        System.out.println("System can read: " + file.canRead());
        System.out.println(soundLoc);
        SoundPlayer soundToPlay = new SoundPlayer(soundLoc);
        soundToPlay.play();
    }
}
It gets weirder, when I fill in the space that numSeq is supposed to fill in, like this:
private static String findSoundFile(String numSeq)
{
    return "file:///Users/user/Desktop/FinishedPhone/110.mp3";
}
The above code, works fine, plays the sound without hang up. Any ideas would be greatly appreciated, and please ask if there's any confusion.

The stacktrace:
java.io.FileNotFoundException: /Users/user/Desktop/FinishedPhone/111.mp3 (No such file or directory)
at java.io.FileInputStream.open(Native Method)
at java.io.FileInputStream.<init>(FileInputStream.java:120)
at java.io.FileInputStream.<init>(FileInputStream.java:79)
at sun.net.www.protocol.file.FileURLConnection.connect(FileURLConnection.java:70)
at sun.net.www.protocol.file.FileURLConnection.getInputStream(FileURLConnection.java:161)
at java.net.URL.openStream(URL.java:1010)
at SoundPlayer.play(SoundPlayer.java:26)
at SerialProcessor.processNumberSequence(SerialProcessor.java:37)
at SerialTest.serialEvent(SerialTest.java:98)
at gnu.io.RXTXPort.sendEvent(RXTXPort.java:732)
at gnu.io.RXTXPort.eventLoop(Native Method)
at gnu.io.RXTXPort$MonitorThread.run(RXTXPort.java:1575)
ls -l of one of the files:
-rw-r--rw-  1 user  staff  432923 Feb 27 14:15 /Users/user/Desktop/FinishedPhone/111.mp3
ls -l for one under 100:
-rw-r--rw-  1 user  staff  480570 Feb 25 20:43 /Users/user/Desktop/FinishedPhone/99.mp3

解决方案
Your numSeq has problem. Try to trim it like this
 return "file:///Users/user/Desktop/FinishedPhone/" + numSeq.trim() + ".mp3


                        
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